NEW YORK (CBSNewYork) — Family, friends and countless volunteers remain determined to find an autistic boy from Queens who has now been missing for three weeks.

Avonte Oquendo, who cannot communicate verbally, was last spotted on surveillance video leaving the Center Boulevard School in Long Island City on Oct. 4, an unauthorized departure from the school located on the East River, CBS 2’s John Slattery reported Friday.

Avonte is 5-foot-3 and weighs 125 pounds. He was last seen wearing a gray striped shirt, black jeans and black shoes.

Anyone with information is asked to contact NYPD Crime Stoppers at 800-577-TIPS, visit the Crime Stoppers website or text tips to 274637 (CRIMES) and enter TIP577.

Autistic Boy From Queens Missing Three Weeks

“We are continuing to put information out. We’re talking to jurisdictions in the northeast quadrant of the United States,” Kelly said.

Kelly said the case has 80 detectives assigned.

“We’ve gotten over 450 leads. We’re looking at a total of 196 pieces of video. Now, all of that video has not been gone through so many of detectives are assigned to going through the video,” said Kelly. “As far as those leads are concerned, all but 48 of those leads have been investigated and closed out.”

“We are continuing to devote significant resources to the effort,” Kelly added.

A shirt police say Avonte Oquendo was wearing the day he went missing/Avonte Oquendo (credit: NYPD)

Avonte’s father pleaded with the public Thursday night to keep their eyes open for his son.